Think about putting the 8" in a small sealed enclosure in the passenger side footwell. There are tons of how to's on the Google machine.
Then put a 12" in the rear.
133whp-126ftlbsTQ Eclipse CD8443,JBL Px300.4, JBL GTO7001, PPI 356cs, JBL p1024(Hooray!) SubThump enclosure, RAAmat BXT, Damplifier Pro
Hatch Nation #140
Caeci caecos ducentes